Ewan McGregor, Naomi Watts 'The Impossible' interview - video

Focusing on one family's real experience of the tsunami during their holiday in Thailand, the film stars McGregor and Watts as married couple Maria and Henry, who are separated from each other and from their children when the storm hits.

"I didn't ever think of it as being a disaster movie," McGregor said. "I get really nervous when I hear people say that.

"I think we all approached it as being a true story, and our job was to be as accurate and truthful as possible about their story, but by telling their story we knew we were telling everybody's story who was there."

Watts and McGregor both went on to discuss the gruelling filming experience, and the impact of working with extras who had genuinely lived through the tsunami.